feat: detect PERT undefined dependencies

[moul]

No description provided.

[codecov]

Codecov Report

Merging #37 into master will increase coverage by 0.13%.
The diff coverage is 73.68%.

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
+ Coverage   62.72%   62.85%   +0.13%     
==========================================
  Files           7        7              
  Lines         735      743       +8     
==========================================
+ Hits          461      467       +6     
- Misses        243      244       +1     
- Partials       31       32       +1

Impacted Files	Coverage Δ
pert.go	81.63% <ø> (ø)	⬆️
attr.go	47.19% <100%> (+2.48%)	⬆️
pert_config.go	48.02% <66.66%> (+0.04%)	⬆️

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